It is highly probable that someone does know.
It is also highly probable that those who both know and who post to
usenet in these groups do not wish to tell you, possibly because they
have killfiled the babblings of someone who has, in many posts over a
considerable period of time, demonstrated that he is clearly insane.
It is certain that you have never articulated a clear reason why you
want to know this information. Someone at Apple, or at ASC, might know,
but you have alienated those sources. Someone at the various
anti-malware system providers might know; at the least they could give
information about their products. You have alienated at least two such
providers and are unlikely in the extreme to get any data from them, and
others might decline to say based on protecting their positions in the
marketplace. Further, I strongly suspect that you would attempt to use
usage data to attack certain anti-malware system providers, and I am
quite sure that others have come to similar opinions. There are third
parties who make it their business to collect this kind of data. Most of
them require payment before turning over the data.